I agree with smaller. But Bee sized? That might be too small, I'm not sure. Again on the one-way vs. two way. Like I said, I'm not opposed to subtle one-way backs as a performer, but I don't really think they have a home at a poker table. If anyone disagrees, feel free to prove me otherwise.
That said, I love the shading on the yellow borders, any chance you could 'symmetricalize' it? Right now, the top right corner is darker than the bottom left, an inverted card would stick out like a sore thumb in the middle of the deck if you were to give the cards even the slightest bevel.